Improvement in double-acting pumps



UNITEE rfi THOMAs N. HENDERSON, OE JAoksoN, MICHIGAN.

IMPROVEMENT IN DOUBLE-ACTING PUMPS.

Specification forming part of Letters Patent No. 131,952, dated October8, 1872.

To all whom it 'may concern:

B e it known that I, THoMAs N. HENDER- SON, of Jackson, in the county ofJackson and State of Michigan, have invented a new and usefulImprovement in Double-Acting Pumps;

and I do declare that the following is a true and accurate descriptionthereof, reference being had to the accompanying drawing and to theletters of reference marked thereon, and

being a part of this specification, in Which- Figure lisa perspectiveview of my improved pump; and Fig. 2 is a longitudinal vertical sectionthrough the pump-cylinders and base-chambers.

VLike letters refer to like parts in each ligure.

This invention relates to an improvement in the construction of thatclass of forcepumps inwhich are employed two alternately-actingplungers; and has for its object to ,simplify the construction'andcheapen the cost of such pumps. The invention consists in the peculiarconstruction of the valve-chambers and passages, and the/arran gementwith relation thereto of the valves, as more fully hereinafter setforth.

In the.drawing,Arepresents a chamber cast d with a bottom to it, inwhich bottom a Waterway, a, is cored in molding it, projecting from theunder surface `like a rib, 'and which also serves to strengthen thebed-plate or bottom. This water-way is cast with a branch or T, b, towhich the `suction is attached.` It into the chamber at each end, andover each opening is hinged an ordinary clack-valve, B, which forms afoot-Valve for its plunger. Across the chamber is cast a partition ordiaphragmh A', near each end, to separate those partswhich contain thefoot-valvesfrom the body ofthe chamber. C C are the cylinders, each ofwhich is cast with a flange, C', at the lower end, which is bolted toand forms a covopens l er for the foot-valve chamber. D is au airchambercast with a flanged bottom, which is bolted to and forms a cover for thecentral compartment of the chamber A. A yokestandard, E, is bolted tothe top of the chamber D, to which standard is pivoted a brake,

F, to which are pivoted the upper ends of the connecting-rods G, whoselower ends are pivoted in the bottoms of the hollow plungers H,

reciprocated in the cylinders (l by the vibrations of the brake. Thediaphragms A' are perforated, and over their openings, on the innersides, are hung the clack-valves B' B', Opening inwardly. I is thedischarge-outlet, in one side ofthe central compartment.

It will be seen that by removing -the cylinders the foot-valves will beexposed, and by taking ofi" the air-chamber the delivery-valves areexposed.4 In pumps of large size handhole-plates may be placed in theend and side Walls ofthe chambers for that purpose. N o facing7 ofthevalve-seats or joints is required in this pump, the covers of thechambers being put on over gaskets.

It is evident that the passages are large and free, and the foot anddelivery-valves placed soclose together that they will act promptly inopening and closing, while for simplicity and cheapness of constructionit is believed to be unequaled. p

What I claimas my invention, and desire to secure by Letters Patent, is

The chamber A, cast with the water-way a proj ectingbelow the bottom toform a strengthenlng-rib, and perforated diaphragms A' A',

and the arrangement with relation thereto of the valves B B B' B', asshown and set forth.

THOMAS N. HENDERSON. Witnesses:

H. F. EBERTs, J. W. BOWLEE.

